Electronic communication is one of the popular ways of communication in this era. E-mail communication is the most popular way of electronic communication. Internet works as the backbone for these communications. In digital forensics, questions is arises that the authors of documents and the author identity, demographic background is linked to other documents or not. So identification of the author(s) of the message(s) and non repudiation are some of the major challenges. Author identification is a critical point to be ensured, because many people are used to copy the content of others. Stylometry can be used for the author identification for text documents. As the non–repudiation and integrity of the message are the major concerns. Stylometry is not only identifying a writing pattern but we can also identify the gender of the human. So this document discussed about identification of author, authentication through stylometry technique. In this paper different stylometric techniques are discussed.